Let's Treat Each Other Like It's December All Year 'Round

Have you ever noticed how in December during the holiday season, the disposition of most folks change? People are nicer to each other. They smile more. They greet each other and do small gestures like holding the door for each other more than throughout the rest of the year. Why can't we do that all year 'round? I'm convinced the world would be a nicer place if we did.